OLED Touch Panel Mesh Layout for Cross-Color Reduction
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Solution Overview
Problem
The integration of a touch function in organic light-emitting diode (OLED) display panels faces challenges due to non-uniform sub-pixel intervals, which can cause metal lines to obstruct light emission, leading to display issues such as cross-color and reduced pixel aperture ratio, and complicates the manufacturing process.
Innovation Solution
A touch display panel design where the orthographic projection of mesh holes of metal meshes cover two adjacent sub-pixels emitting the same color, with a closer center distance than sub-pixels of different colors, ensuring metal lines are farther from pixel opening regions, and sharing sub-pixels to reduce manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal lines are arranged to cover each sub-pixel individually, then touch function is implemented, but metal lines obstruct light emission causing cross-color and reduced pixel aperture ratio
Solution Approach 1:
The patent merges the metal lines corresponding to two adjacent sub-pixels of the same color into a single shared metal line. This reduces the total number of metal lines, decreases light obstruction, and prevents cross-color effects while maintaining touch functionality. For example, two adjacent green sub-pixels share one metal line instead of each having separate metal lines.
Solution Approach 2:
The shared metal line serves multiple functions: it acts as the touch electrode for both adjacent sub-pixels simultaneously and provides electrical connection for both sub-pixels. This multi-functionality reduces the number of components needed and improves light emission by reducing metal line coverage.
2Manufacturing precision
If separate evaporation processes are used for each sub-pixel, then manufacturing precision is maintained, but manufacturing process becomes complex and costly
Solution Approach 1:
The patent combines two adjacent sub-pixels of the same color into a single evaporation unit, allowing them to be manufactured in one evaporation process rather than requiring separate processes. This reduces manufacturing complexity and cost while maintaining precision through the shared structure design.
Solution Approach 2:
The patent designs the sub-pixel structure in advance with shared metal lines and common evaporation units, so that during manufacturing, fewer separate evaporation steps are needed. The preliminary structural design enables more efficient manufacturing processes.
3Ease of operation
If metal lines are placed closer to pixel opening regions, then touch sensitivity is improved, but light obstruction increases causing display issues
Solution Approach 1:
By merging metal lines for adjacent sub-pixels into shared lines, the patent reduces the total metal line area, which decreases light obstruction and improves pixel aperture ratio. The shared metal lines are positioned to cover both sub-pixels effectively for touch sensitivity while occupying less total space than separate metal lines would require.
Data Source
AI summary
A touch display panel, includes: a base substrate, and a display structure and a touch structure that are stacked on the base substrate, the touch structure includes a first metal mesh layer, an orthographic projection of a mesh hole of at least one first metal mesh of the first metal mesh layer on the base substrate covers orthographic projections of two pixel opening regions of two adjacent sub-pixels on the base substrate, and the two adjacent sub-pixels are configured to emit light of a first primary color; and a center distance between two pixel opening regions is smaller than a center distance between two pixel opening regions of two sub-pixels emitting light of same one other primary color, which is different to the first primary color. The touch display panel has a good display effect.